[llvm-commits] [llvm] r108634 - /llvm/trunk/lib/CodeGen/RegAllocPBQP.cpp

[Lang Hames]

Author: lhames
Date: Sat Jul 17 19:57:59 2010
New Revision: 108634

URL: http://llvm.org/viewvc/llvm-project?rev=108634&view=rev
Log:
Added -pbqp-pre-coalescing flag to PBQP. If enabled this will cause PBQP to require
LoopSplitter be run prior to register allocation.

Entirely for testing purposes at the moment.


Modified:
    llvm/trunk/lib/CodeGen/RegAllocPBQP.cpp

Modified: llvm/trunk/lib/CodeGen/RegAllocPBQP.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/RegAllocPBQP.cpp?rev=108634&r1=108633&r2=108634&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/RegAllocPBQP.cpp (original)
+++ llvm/trunk/lib/CodeGen/RegAllocPBQP.cpp Sat Jul 17 19:57:59 2010
@@ -34,6 +34,7 @@
 #include "PBQP/HeuristicSolver.h"
 #include "PBQP/Graph.h"
 #include "PBQP/Heuristics/Briggs.h"
+#include "Splitter.h"
 #include "VirtRegMap.h"
 #include "VirtRegRewriter.h"
 #include "llvm/CodeGen/CalcSpillWeights.h"
@@ -65,6 +66,11 @@
                 cl::desc("Attempt coalescing during PBQP register allocation."),
                 cl::init(false), cl::Hidden);
 
+static cl::opt<bool>
+pbqpPreSplitting("pbqp-pre-splitting",
+                 cl::desc("Pre-splite before PBQP register allocation."),
+                 cl::init(false), cl::Hidden);
+
 namespace {
 
   ///
@@ -96,6 +102,8 @@
       au.addPreserved<LiveStacks>();
       au.addRequired<MachineLoopInfo>();
       au.addPreserved<MachineLoopInfo>();
+      if (pbqpPreSplitting)
+        au.addRequired<LoopSplitter>();
       au.addRequired<VirtRegMap>();
       MachineFunctionPass::getAnalysisUsage(au);
     }